AMD EPYC 4545P vs AMD Ryzen AI 9 HX PRO 475 Comparison

The AMD EPYC 4545P and AMD Ryzen AI 9 HX PRO 475 are both Zen 5 parts, but they serve completely different segments. The EPYC 4545P is a server/workstation processor on Socket AM5, while the Ryzen AI 9 HX PRO 475 is a mobile chip on Socket FP8. The benchmark data shows a decisive performance gap between them. The EPYC 4545P wins all 11 head-to-head benchmark comparisons, with an average benchmark score of 75,373, placing it in the 95th percentile of all CPUs. The Ryzen AI 9 HX PRO 475 scores an average of 74,496, which still places it in the 94th percentile, but it trails its desktop-oriented sibling in every single workload tested. The data is clear: the EPYC 4545P is the raw performance king, while the Ryzen AI 9 HX PRO 475 is a lower-power mobile part that trades performance for portability.

The Verdict

Choose the AMD EPYC 4545P if you need maximum compute throughput and are building a stationary workstation or server. It has 16 cores and 32 threads, whereas the Ryzen AI 9 HX PRO 475 offers 12 cores and 24 threads. The EPYC 4545P also carries a 64 MB L3 cache, compared to just 16 MB on the mobile chip. Benchmarks confirm the EPYC's dominance: it is 46.6% ahead in PassMark multithread, 58.4% ahead in floating-point math, and 68.3% ahead in integer math. Its 5.40 GHz boost clock also edges out the Ryzen's 5.20 GHz, and it delivers a 0.4% win in single-thread performance, with a score of 4,318 versus 4,301.

Choose the AMD Ryzen AI 9 HX PRO 475 if power efficiency and mobility are your priorities. Its 28 W TDP is less than half of the EPYC 4545P's 65 W TDP. It is an active, current-generation mobile processor designed for laptops. While it loses every benchmark comparison, its scores are still strong for a mobile part. It achieves a PassMark multithread score of 36,487 and a single-thread score of 4,301, which puts it in the 94th percentile of all CPUs. This means it is a capable processor for mobile workloads, but it is not a substitute for the EPYC's brute-force multi-core performance.

The core decision hinges on your use case. If you need sustained, heavy multi-threaded compute in a desktop or server chassis, the EPYC 4545P is the only choice. If you need a high-performing CPU that fits in a laptop and sips power, the Ryzen AI 9 HX PRO 475 is the clear pick. The data does not suggest they are interchangeable; they target separate markets with separate priorities.

Where Each One Wins

The AMD EPYC 4545P wins in every category where raw compute throughput matters. In PassMark's multithread test, it scores 53,504 versus the Ryzen's 36,487, a 46.6% advantage. Its lead is even larger in integer math, where it scores 213,485 against 126,829, a 68.3% margin. The EPYC also dominates in floating-point math with a score of 126,505, which is 58.4% higher than the Ryzen's 79,887. The EPYC's edge extends to specialized workloads: it is 124.6% faster in find prime numbers (292 vs 130) and 73.7% faster in physics calculations (3,260 vs 1,877). In data compression, the EPYC scores 636,279 versus 461,650, a 37.8% win, and in data encryption it is 62.5% faster (37,598 vs 23,132). The EPYC also leads in extended instructions (46,231 vs 31,969, a 44.6% gap) and random string sorting (73,850 vs 48,894, a 51% gap).

The AMD Ryzen AI 9 HX PRO 475's only close result is in single-thread performance. It scores 4,301, which is just 0.4% behind the EPYC 4545P's 4,318. This shows that the mobile chip's core architecture is competitive per-core, but it simply lacks the core count and cache size to compete in multi-threaded tasks. For users, this means the Ryzen AI 9 HX PRO 475 will feel responsive in day-to-day tasks and lightly threaded applications, but it will struggle under heavy parallel workloads where the EPYC excels. The EPYC 4545P's 16 cores, 32 threads, and 64 MB L3 cache give it a fundamental structural advantage that the Ryzen cannot overcome.

Architecture Differences

Both processors use AMD's Zen 5 architecture and are built on TSMC's 4 nm process node. The key differences lie in their configurations and target platforms. The EPYC 4545P uses the "Grado" codename and belongs to the EPYC 4005 series. It has 16 cores and 32 threads, with a base clock of 3.00 GHz and a boost clock of 5.40 GHz. Its cache hierarchy includes 80 KB of L1 per core, 1 MB of L2 per core, and a large 64 MB L3 cache. It is built on a dual-chiplet design with a die size of 2x 70.6 mm², containing 16,630 million transistors. It supports DDR5 memory over a dual-channel bus with 89.6 GB/s of bandwidth, and it has ECC memory support. The EPYC 4545P uses AMD Socket AM5 and has a 65 W TDP. Its PCIe interface is Gen 5 with 24 lanes (CPU only), and it includes integrated Radeon Graphics.

The Ryzen AI 9 HX PRO 475 uses the "Gorgon Point" codename and belongs to the Ryzen AI PRO 400 generation. It has 12 cores and 24 threads, with a base clock of 2.00 GHz and a boost clock of 5.20 GHz. Its cache is smaller: 80 KB of L1 per core, 1 MB of L2 per core, and only 16 MB of L3. It is a monolithic design with a die size of 233 mm². The Ryzen AI 9 HX PRO 475 supports both DDR5 and LPDDR5X memory over a dual-channel bus, also with 89.6 GB/s of bandwidth, and it also supports ECC memory. It uses AMD Socket FP8, has a 28 W TDP, and its PCIe interface is Gen 4 with 16 lanes (CPU only). It features a more capable integrated GPU, the Radeon 890M, compared to the EPYC's generic Radeon Graphics. The Ryzen AI 9 HX PRO 475 is a mobile segment part, while the EPYC 4545P is for servers and workstations.

The biggest architectural divergence is in core count and cache size. The EPYC 4545P has 33% more cores and 4x the L3 cache of the Ryzen AI 9 HX PRO 475. This directly translates to its massive multi-threaded performance advantage. The Ryzen compensates with a lower TDP and a monolithic die, which is better suited for mobile power management. The EPYC's dual-chiplet design is optimized for server workloads, while the Ryzen's single die is designed for laptop integration.

FAQ

Q: Which processor has more cores?

A: The AMD EPYC 4545P has 16 cores and 32 threads. The AMD Ryzen AI 9 HX PRO 475 has 12 cores and 24 threads.

Q: Is the Ryzen AI 9 HX PRO 475 faster in any benchmark?

A: No. The EPYC 4545P wins all 11 head-to-head benchmark comparisons. The closest result is in PassMark single-thread, where the EPYC scores 4,318 and the Ryzen scores 4,301, a 0.4% difference in favor of the EPYC.

Q: What is the difference in power consumption?

A: The EPYC 4545P has a TDP of 65 W, while the Ryzen AI 9 HX PRO 475 has a TDP of 28 W. The Ryzen uses less than half the power of the EPYC.

Q: Which processor has more L3 cache?

A: The EPYC 4545P has 64 MB of L3 cache. The Ryzen AI 9 HX PRO 475 has 16 MB of L3 cache. The EPYC has four times the L3 cache of the Ryzen.

Q: Do both processors support ECC memory?

A: Yes, both the AMD EPYC 4545P and the AMD Ryzen AI 9 HX PRO 475 support ECC memory.

Q: What is the memory bandwidth of each processor?

A: Both processors have the same memory bandwidth of 89.6 GB/s, and both use a dual-channel memory bus.

Head-to-Head Benchmarks

The benchmark data is overwhelmingly in favor of the AMD EPYC 4545P. The largest single win for the EPYC is in PassMark's find prime numbers test, where it scores 292 versus the Ryzen's 130, a massive 124.6% delta. This indicates the EPYC's raw integer computation capability is far superior, likely due to its higher core count and larger cache. Similarly, in PassMark physics, the EPYC scores 3,260, which is 73.7% higher than the Ryzen's 1,877. This test is heavily multi-threaded and the EPYC's 16 cores provide a clear advantage.

In integer math, the EPYC scores 213,485 against the Ryzen's 126,829, a 68.3% margin. This is a fundamental workload for general computing, and the EPYC's lead shows its dominance in everyday multi-threaded tasks. Floating-point math shows a similar story: 126,505 for the EPYC versus 79,887 for the Ryzen, a 58.4% delta. This is important for scientific and engineering applications. In data encryption, the EPYC is 62.5% faster (37,598 vs 23,132), showing its strength in security-related workloads.

The EPYC's lead narrows in some tests but remains significant. In PassMark multithread, it scores 53,504 versus 36,487, a 46.6% advantage. In extended instructions, the EPYC scores 46,231 versus 31,969, a 44.6% delta. Data compression shows a 37.8% lead (636,279 vs 461,650), and random string sorting shows a 51% lead (73,850 vs 48,894). The only close race is single-thread performance, where the EPYC scores 4,318 and the Ryzen scores 4,301, a 0.4% delta. This shows that per-core performance is nearly identical, but the EPYC's additional cores and cache are what drive its massive overall performance advantage.

Specification Differences

The specification differences between the two processors are extensive. The EPYC 4545P has 16 cores and 32 threads, while the Ryzen AI 9 HX PRO 475 has 12 cores and 24 threads. The EPYC's base clock is 3.00 GHz, and its boost clock is 5.40 GHz; the Ryzen's base clock is 2.00 GHz, and its boost clock is 5.20 GHz. The TDP differs significantly, with the EPYC at 65 W and the Ryzen at 28 W. The EPYC uses AMD Socket AM5, while the Ryzen uses AMD Socket FP8. The L3 cache is 64 MB on the EPYC and 16 MB on the Ryzen. The EPYC has a dual-chiplet die size of 2x 70.6 mm², whereas the Ryzen has a monolithic die size of 233 mm². The EPYC's PCIe interface is Gen 5 with 24 lanes, while the Ryzen's is Gen 4 with 16 lanes. The integrated graphics differ: the EPYC has Radeon Graphics, while the Ryzen has the more advanced Radeon 890M. The EPYC is in the Server/Workstation market segment, while the Ryzen is in the Mobile segment. The EPYC has a launch MSRP of $549, while the Ryzen has no listed launch MSRP.